title: Au nanotip as luminescent near-field probe.
abstract: We introduce a new optical near-field mapping method, namely utilizing the plasmon-mediated luminescence from the apex of a sharp gold nanotip. The tip acts as a quasi-point light source which does not suffer from bleaching and gives a spatial resolution of ≤25 nm. We demonstrate our method by imaging the near field of azimuthally and radially polarized plasmonic modes of nonluminescent aluminum oligomers.
authors.affiliation: Institute of Physical and Theoretical Chemistry, University of Tübingen, Tübingen, Germany. sebastian.jaeger@uni-tuebingen.de
authors.forename: Sebastian
authors.initials: S
authors.lastname: Jäger
authors.forename: Andreas M
authors.initials: AM
authors.lastname: Kern
authors.forename: Mario
authors.initials: M
authors.lastname: Hentschel
authors.forename: Regina
authors.initials: R
authors.lastname: Jäger
authors.forename: Kai
authors.initials: K
authors.lastname: Braun
authors.forename: Dai
authors.initials: D
authors.lastname: Zhang
authors.forename: Harald
authors.initials: H
authors.lastname: Giessen
authors.forename: Alfred J
authors.initials: AJ
authors.lastname: Meixner